Memory specs for cisco 2911 ISR with using ibgp

Unanswered Question
Paolo Bevilacqua Tue, 02/23/2010 - 07:42

Full routes on a 2911 ??? Beside the memory issue, what is the requiremt for full routes ???

Paolo Bevilacqua Tue, 02/23/2010 - 08:17

Customer request is wrong then. You can certainly fit table in memory, problem is router will spend most of his time uncessarily processing updates.

It is not like 15 yrs ago when there were only 1 or 2 updates per second.

Full routes are required only when doing transit or few other specific situations.

Giuseppe Larosa Tue, 02/23/2010 - 09:43

Hello Mike,

memory specs for 2900 series are 512 MB to 2 GB of RAM


as Paolo has noted you can have enough memory to handle the BGP table (use of C3845 with 512 MB has been reported by other colleagues).

I agree that cpu power may be the bottleneck.

Without testing this platform in a lab it would be a risk to deploy it, in other words you are going to use a router that has not been probably tested by Cisco for this job.

The first safe choice would be a 7206 VXR with NPE G2 and 2GB of RAM, that is also a good choice for a route reflector server.

Having only one iBGP session and one eBGP session can help, but what if later another ISP is added?

Hope to help


The 7200 series is the data center platform I've suggested to him but he's one of these "I'll see what

I can find on my own" guys. So, while he may not understand the risk of the cpu issue and creating a notwork instead of a network, the cost of the memory should open his eyes...especially when buying into a risk.

Thanks guys.


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